sqlalchemy, specify database name with DSN

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I am trying to connect to a SQL Server from Linux using sqlalchemy. This page shows DSN-based connection as below.

engine = create_engine("mssql+pyodbc://scott:tiger@some_dsn")

Is there a way to specify a database name using DSN? I am aware that we can specify a database name either in odbc.ini or a SQL query but I would like to know if we can also do something like this.

engine = create_engine("mssql+pyodbc://scott:tiger@some_dsn/databasename")

pyodbc sqlalchemy sql-server python
2 Answers

You can pass arguments directly to the pyodbc.connect method through the connect_args parameter in create_engine:

def my_create_engine(mydsn, mydatabase, **kwargs):
    connection_string = 'mssql+pyodbc://@%s' % mydsn
    cargs = {'database': mydatabase}
    cargs.update(**kwargs)
    e = sqla.create_engine(connection_string, connect_args=cargs)
    return e

This will also enable the database to be persisted through several transactions / sessions.

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